使用 SAX 解析器解析 Xml

Question

我正在尝试使用 SAX 解析器解析 xml 文件。 我需要获取属性及其起始元素的值

<?xml version="1.0" encoding="ISO-8859-1" ?>
<API type="Connection">
<INFO server="com.com" function="getAccount2" />
<RESULT code="0">Operation Succeeded</RESULT>
<RESPONSE numaccounts="1">
<ACCOUNT login="fa051981" skynum="111111" maxaliases="1" creationdate="Fri Nov 16 00:59:59 2001"    password="pass" type="2222" status="open" mnemonic="32051981" ratelimit="0">
    <CHECKATTR />
    <REPLYATTR>Service-Type = Frames-User, Framed-Protocol = PPP, Framed-Routing = None</REPLYATTR>
    <SETTINGS bitval="4" status="open" />
    <SETTINGS bitval="8192" status="open" session_timeout="10800" />
    <SETTINGS bitval="32768" status="open" cisco_address_pool="thepool" />
    <ALIASES numaliases="0" />
</ACCOUNT>
</RESPONSE>
</API>

在这个 xml 中，我需要获取设置标签/开始元素属性及其值。

这些属性是动态的，所以我正在尝试制作它们的地图。我是 SAX 解析器的新手。

到目前为止我的java代码：

public void startElement(String s, String s1, String elementName, Attributes attributes) throws SAXException {

    if (elementName.equalsIgnoreCase(GenericConstants.INFO)) {
        this.searchRaidusBean.setServer(attributes.getValue(GenericConstants.SERVER));
        this.searchRaidusBean.setFunction(attributes.getValue(GenericConstants.FUNCTION));
    }
    if (elementName.equalsIgnoreCase(GenericConstants.RESULT)) {
        this.searchRaidusBean.setResultCode(attributes.getValue(GenericConstants.CODE));
    }

    if (elementName.equalsIgnoreCase(GenericConstants.ACCOUNT)) {
        this.searchRaidusBean.setLoginId(attributes.getValue(GenericConstants.LOGIN));
    }
    if (elementName.equalsIgnoreCase(GenericConstants.ACCOUNT)) {
        this.searchRaidusBean.setSkyNum(attributes.getValue(GenericConstants.SKYNUM));
    }
    if (elementName.equalsIgnoreCase(GenericConstants.ACCOUNT)) {
        this.searchRaidusBean.setMaxAliases(attributes.getValue(GenericConstants.MAXALIASES));
    }
    if (elementName.equalsIgnoreCase(GenericConstants.ACCOUNT)) {
        this.searchRaidusBean.setCreationDate(attributes.getValue(GenericConstants.CREATION_DATE));
    }
    if (elementName.equalsIgnoreCase(GenericConstants.ACCOUNT)) {
        this.searchRaidusBean.setType(attributes.getValue(GenericConstants.TYPE));
    }
    if (elementName.equalsIgnoreCase(GenericConstants.ACCOUNT)) {
        this.searchRaidusBean.setStatus(attributes.getValue(GenericConstants.STATUS));
    }
    if (elementName.equalsIgnoreCase(GenericConstants.ACCOUNT)) {
        this.searchRaidusBean.setMnemonic(attributes.getValue(GenericConstants.MNEMONIC));
    }
    if (elementName.equalsIgnoreCase(GenericConstants.ACCOUNT)) {
        this.searchRaidusBean.setRateLimit(attributes.getValue(GenericConstants.RATELIMIT));
    }
    if (elementName.equalsIgnoreCase(GenericConstants.SETTINGS)) {
        //this.searchRaidusBean.getBitval().add(attributes.getValue(GenericConstants.BITVAL));
        System.out.println(attributes);
        //stuck here
    }
    if (elementName.equalsIgnoreCase(GenericConstants.ALIASES)) {
        this.tempKey = attributes.getValue(GenericConstants.MNEMONIC);
    }
}



public void endElement(String str1, String str2, String element) throws SAXException {
    if (element.equalsIgnoreCase(GenericConstants.RESULT)) {
        this.searchRaidusBean.setResultMessage(this.tempValue);
    }
    if (element.equalsIgnoreCase(GenericConstants.ALIASES)) {
        if (!StringUtils.isBlank(this.tempKey)) {
            this.searchRaidusBean.getAlias().put(this.tempKey, this.tempValue);
        }
    }
}


public void characters(char[] charArray, int i, int j) throws SAXException {
    this.tempValue = new String(charArray, i, j);
}

Answer 1

如果您使用的是DefaultHandler，那么您将收到startElement 事件。

此方法带有Attributes 作为其参数之一。

您需要使用getIndex(String) 获取命名属性的索引，使用getValue(int) 获取所述属性的值。

正如 Nambari 所指出的，互联网上有数百个教程，关于 SO 主题的帖子不止几篇（我在周末回答了一篇）。

更新

我建议它应该看起来像这样（我还没有测试过）

public void startElement(String uri, String localName, String elementName, Attributes attributes) throws SAXException {

    if (elementName.equalsIgnoreCase(GenericConstants.INFO)) {
        this.searchRaidusBean.setServer(attributes.getValue(GenericConstants.SERVER));
        this.searchRaidusBean.setFunction(attributes.getValue(GenericConstants.FUNCTION));
    }
    if (elementName.equalsIgnoreCase(GenericConstants.RESULT)) {
        this.searchRaidusBean.setResultCode(attributes.getValue(GenericConstants.CODE));
    }

    if (elementName.equalsIgnoreCase(GenericConstants.ACCOUNT)) {
        this.searchRaidusBean.setLoginId(attributes.getValue(GenericConstants.LOGIN));
        this.searchRaidusBean.setSkyNum(attributes.getValue(GenericConstants.SKYNUM));
        this.searchRaidusBean.setMaxAliases(attributes.getValue(GenericConstants.MAXALIASES));
        this.searchRaidusBean.setCreationDate(attributes.getValue(GenericConstants.CREATION_DATE));
        this.searchRaidusBean.setType(attributes.getValue(GenericConstants.TYPE));
        this.searchRaidusBean.setStatus(attributes.getValue(GenericConstants.STATUS));
        this.searchRaidusBean.setMnemonic(attributes.getValue(GenericConstants.MNEMONIC));
        this.searchRaidusBean.setRateLimit(attributes.getValue(GenericConstants.RATELIMIT));
    }

    if (elementName.equalsIgnoreCase(GenericConstants.SETTINGS)) {

        for (int index = 0; index < attributes.getLength(); index++) {

            String attName = attributes.getLocalName(index);
            String value = attributes.getValue(index);

            map.put(attName, value);

        }

    }

    if (elementName.equalsIgnoreCase(GenericConstants.ALIASES)) {
        this.tempKey = attributes.getValue(GenericConstants.MNEMONIC);
    }

}

已更新测试示例

我带了你数据（来自 OP）并通过以下处理程序运行它

DefaultHandler handler = new DefaultHandler() {
    @Override
    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {

        if (qName.equalsIgnoreCase("settings")) {

            System.out.println("Parse settings attributes...");

            for (int index = 0; index < attributes.getLength(); index++) {

                String aln = attributes.getLocalName(index);
                String value = attributes.getValue(index);

                System.out.println("    " + aln + " = " + value);


            }

        }

    }
};

我得到了以下输出

Parse settings attributes...
    bitval = 4
    status = open
Parse settings attributes...
    bitval = 8192
    status = open
    session_timeout = 10800
Parse settings attributes...
    bitval = 32768
    status = open
    cisco_address_pool = thepool

所以我不知道你在做什么。